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Chinaxiv:202105.00073V1 Invertebrates and Smaller Or Younger Fishes Known to Occur in the Same Biota

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Chinaxiv:202105.00073V1 Invertebrates and Smaller Or Younger Fishes Known to Occur in the Same Biota ChinaXiv合作期刊 A new species of Pteronisculus from the Middle Triassic (Anisian) of Luoping, Yunnan, China, and phylogenetic relationships of early actinopterygian fishes REN Yi1,2,3 XU Guang-Hui1,2* (1 Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Beijing 100044 * Corresponding author: [email protected]) (2 CAS Center for Excellence in Life and Paleoenvironment Beijing 100044) (3 University of Chinese Academy of Sciences Beijing 100049) Abstract Actinopterygii, the largest group of extant vertebrates, includes Cladistia, Actinopteri (Chondrostei plus Neopterygii) and closely related fossil taxa. The extinct genus Pteronisculus belongs to a stem lineage of actinopterygian fishes represented by 11 species from the Early Triassic of Madagascar, Europe and North America, and a single species from the early Middle Triassic of China. Here, we report the discovery of a new species of this genus, Pteronisculus changae, on the basis of five well-preserved specimens from the Middle Triassic (Anisian) marine deposits exposed in Luoping, eastern Yunnan, China. The discovery documents the second convincing species of Pteronisculus in the Middle Triassic and the largest stem actinopterygian fish in the Luoping Biota, having a maximum total length of up to 295 mm. The new species possesses a toothed lacrimal, which is characteristic of Pteronisculus, but it is easily distinguished from other species of the genus by some autapomorphies, e.g., a medial process at the middle portion of the intertemporal, 21 supraneurals, and 83 lateral line scales. The results of our cladistic analysis provide new insights into the relationships of early actinopterygians and recover Pteronisculus as a sister taxon of the Carboniferous rhadinichthyid Cyranorhis at the actinopterygian stem. Based on the body form, teeth and other features, it can be deduced that Pteronisculus changae is likely a relatively fast-swimming predator, feeding on planktonic chinaXiv:202105.00073v1 invertebrates and smaller or younger fishes known to occur in the same biota. As one of the youngest species of the genus, the new species provides additional evidence to suggest that the diversity of Pteronisculus is higher than previously thought and that the eastern Paleotethys Ocean likely constituted a refuge for species of this genus during the early Middle Triassic. Key words Luoping, Yunnan; Middle Triassic; Pteronisculus, Actinopterygii; phylogeny Citation Ren Y, Xu G H, in press. A new species of Pteronisculus from the Middle Triassic (Anisian) of Luoping, Yunnan, China, and phylogenetic relationships of early actinopterygian fishes. Vertebrata PalAsiatica. DOI: 10.19615/j.cnki.2096-9899.210518 中国科学院战略性先导科技专项(B类) (编号：XDB 26000000, 18000000)、国家自然科学基金(批准号： 41672001, 41688103)和中国科学院前沿科学重点研究项目(编号：QYZDB-SSW-DQC040)资助。 收稿日期：2021-01-28 ChinaXiv合作期刊 2 Vertebrata PalAsiatica 1 Introduction Actinopterygii (ray-finned fishes) is the most diverse clade of living vertebrates comprising Cladistia, Actinopteri (Chondrostei plus Neopterygii) and their closely related fossil taxa (Patterson, 1982; Gardiner, 1984; Coates, 1999; Hurley et al., 2007; Sallan, 2014; Friedman, 2015; Giles et al., 2017; Argyriou et al., 2018). The oldest proposed actinopterygian is the Early Devonian (~415 Ma) Meemannia on the basis of a few detached skull roofs and an isolated lower jaw (Zhu et al., 1999; Lu et al., 2016); even earlier candidates are represented by fragments subject to differing phylogenetic interpretations (Wang and Dong, 1989; Basden and Young, 2001; Schultze, 2015). The earliest widely accepted actinopterygian based on relatively complete specimens is the Middle Devonian (Eifelian, ~390 Ma) Cheirolepis spp. (Pearson and Westoll, 1979; Pearson, 1982; Arratia and Cloutier, 1996; Lu et al., 2016; Giles et al., 2017). There are so far 22 actinopterygian species (in 16 genera) recovered from the Devonian, according to our preliminary statistics. A greater diversification of actinopterygians occurred in the Carboniferous and Permian, with about 100 genera known from those periods (Gardiner, 1993; Lund and Poplin, 1997; Lund, 2000; Poplin and Lund, 2000, 2002; Bender, 2002, 2005; Figueiredo and Carvalho, 2004; Hamel, 2005; Mickle et al., 2009; Mickle, 2018; Wilson et al., 2018 and others). In the aftermath of the end-Permian mass extinction, neopterygians underwent a rapid radiation and basal actinopterygians (traditionally referred to the paraphyletic ‘Palaeonisciformes’) greatly declined and died out at the end of the Cretaceous (Friedman, 2015). Pteronisculus is a basal actinopterygian genus with a geological range confined to Early to Middle Triassic. Until recently, 12 species were referred to the genus (Fig. 1A; Online Supplementary Material); among which there are four well-studied species based on relatively complete specimens: the Early Triassic P. cicatrosus (type species, Madagascar), P. stensioi (modified from P. stensiöi, according to the International Code of Zoological Nomenclature chinaXiv:202105.00073v1 32.5.2.1) and P. magnus (Greenland), and the Middle Triassic (Anisian) P. nielseni (South China). Although possible species of Pteronisculus were also reported from the late Permian (Lopingian) continental deposits of South Africa (Gardiner, 1966; Bender, 2004) and Early Triassic marine deposits of Alberta and British Columbia in Canada (Schaeffer and Mangus, 1976), they are based on poorly-preserved specimens and their reference to this genus is questionable (Romano et al., 2019). The relationships between Pteronisculus and other early actinopterygians are controversial; the genus has been recovered as either a stem actinopteran (Gardiner and Schaeffer, 1989; Xu and Gao, 2011; Xu et al., 2014a) or a stem actinopterygian (Giles et al., 2017; Argyriou et al., 2018). Additionally, the interrelationships between species of Pteronisculus have never been explored in a phylogenetic analysis. Here, we report the discovery of a new species of Pteronisculus on the basis of five specimens from the Second Member of the Guanling Formation exposed near Dawazi village, Luoping Country in Yunnan Province (Fig. 1C). The specimens are nearly complete and well- ChinaXiv合作期刊 Ren & Xu -A new species of Pteronisculus from the Middle Triassic of Luoping 3 preserved in thinly laminated micritic limestone, permitting a detailed description of the morphology of the new species. The discovery documents the second species of Pteronisculus in South China (or more generally in Asia), and represents one of the youngest members of this genus, along with P. nielseni from the same fossil beds. A phylogenetic analysis was performed to resolve the interrelationships between Pteronisculus and other early actinopterygians. In addition to the new species of Pteronisculus reported here, other macrofossils have been reported from the same fossiliferous horizons at the Luoping localities, including plants, invertebrates, diverse marine reptiles and other taxa of ray-finned fishes (Tintori et al., 2007, 2010; Sun et al., 2009, 2015, 2016; López-Arbarello et al., 2011; Wu et al., 2011; Xu and Wu, 2012; Feldmann et al., 2012; Wen et al., 2012, 2013, 2019; Xu and Ma, 2016; Xu and Zhao, chinaXiv:202105.00073v1 Fig. 1 Fossil localities of Pteronisculus A. Map showing the global distribution of fossil localities of Pteronisculus: ① Yunnan, China, ② Spitsbergen (Svalbard), Norway ③ East Greenland, ④ Nevada, USA, ⑤ Madagascar; B. Geographic locality yielding Pteronisculus changae sp. nov. in Luoping, Yunnan, China; C. Map of eastern Yunnan showing the fossil locality (World map: GS(2016)No. 1611; China map: GS(2016)No. 1549) ChinaXiv合作期刊 4 Vertebrata PalAsiatica 2016; Xu et al., 2014a, b; Ma and Xu, 2017; Xu, 2020a). The whole of the fossil assemblage, known as the Luoping Biota, was suggested to have inhabited a semi-enclosed intraplatform basin (Hu et al., 2011; Benton et al., 2013). The age of this biota (Pelsonian, Anisian, ~244.2 Ma) is well constrained by conodont biozonation and zircon dating (Zhang et. al., 2009, 2015). 2 Material and methods All specimens are housed in the fossil collections of the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences in Beijing, China. They were mechanically prepared with sharp steel needles. For better contrast, some specimens were dusted with ammonium chloride (NH4Cl) or immersed in water before being photographed. The relative positions of the fins and scale row counts follow Westoll (1944). The measurements of the specimens (Fig. 2) are as described in Schultze and Bardack (1987). The estimations of suspensorium angles are following Gardiner et al. (2005). The anatomical terms and bone names follow Gardiner and Schaeffer (1989), Grande and Bemis, 1998; Arratia, 2009 and Xu et al. (2014b). A phylogenetic analysis was conducted by incorporating the new species of Pteronisculus into the matrix of Argyriou et al. (2018), which was in turn derived from that of Giles et al. (2017). Since the focus of this analysis is on the interrelationships of early actinopterygian clades above Cheirolepis level, we chose the basal sarcopterygian Guiyu as the outgroup, and removed other non-actinopterygians, as well as some actinopterygians based on incomplete or poorly preserved specimens (e.g., Meemannia, Lawrenciella and Tanaocrossus), and a few crown neopterygians (e.g., Macrepistius) from the data matrix. We added seven characters
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